thyroglossal duct
An embryonic structure connecting the developing thyroid gland to the tongue base. Normally disappears by 10 weeks gestation.
Full Definition
The thyroglossal duct is an embryonic structure that connects the developing thyroid gland at the base of the tongue (foramen cecum) to its final position in the lower neck. During normal development, this duct disappears by approximately 10 weeks of gestation, leaving only the pyramidal lobe as a remnant in some individuals. Failure of complete duct regression can result in thyroglossal duct cysts, which can occur anywhere along the path from the tongue base to the thyroid gland. Understanding this embryological anatomy is essential for diagnosing and treating thyroglossal duct abnormalities.
Usage
Usage note: Distinguish from thyroglossal duct cyst, which is a pathological remnant.
In Context
- "The thyroglossal duct normally involutes during fetal development." — Embryology textbook
- "Persistence of thyroglossal duct tissue led to cyst formation." — Pathology report